Sand-molding machine



(No Model.)

T. SOHEBF.

SAND MOLDING MACHINE. No. 439,430. Patented Oct. 28, 1890.

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r I T" i f i I WITNESSES. I 61 %Vbm NITED STATES PATENT QFFICE.

THEODORE SCHERF, OF ELIZABETH, NElV JERSEY.

SAND-MOLDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 439,430, dated October28, 1890.

Application filed July 16, 1890. Serial No. 358,944.- (No model.)

To all whom it may concern:

Be it known that I, THEODORE SOHERF, of Elizabeth, in the county ofUnion and State of New Jersey, a citizen of the United States, haveinvented certain new and useful Improvements in Sand-Molding Machines,of which the following is a specification.

This invention relates to certain improvements in that class of machineswhich are used by metal-founders in producing sandmolds for castings,the improvements being designed with a view to prevent the sand fromgetting access to the working parts of the machine, which necessitatesthe frequent taking apart of the machine, whereby considerable expenseand loss of time is incurred.

The invention consists of a sand-molding machine for metal-founders inwhich the pattern-supporting block is supported on a spindle that isguided inabox attached to a movable truck or carriage, the pattern beingattached to said block and surrounded by a stripping-plate that issupported on standards of the truck-platform. A sand-box is attached tothe stripping-plate by means of pins and keepers, so as to inclose thepattern, and a sliding and spring-actuated frame that is adapted to bemoved into the sand-box and be locked to the same after it is pressedinto the same. Alocking-bolt supports the pattern-block and its spindlein raised position for molding, said bolt being unlocked by means of aslide-rod that is actuated by a fixed roller between the track when themachine is moved over the same, said slide-rod having an inclined groovefor said roller, while a second roller enters an inclined groove of thespindle and withdraws thereby the pattern-block and pattern from thesand as the truck is moved out of the mold-press.

In the accompanying drawings, Figure 1 represents a side elevation of myimproved molding-machine for metal-founders, and Fig. 2 is a verticallongitudinal section of the same.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, K represents a truck or carriage of thatclass which is used in connection with Tabors steam-presses for molders.To the truck or carriage K is applied a table or platform J, to whichall the supporting parts of my improved molding-machine are attached.Upright standards E are attached to the table J, saidstandardssupporting at their upper ends a stripping-plate F, which isprovided with an opening that corresponds to the size of the pattern, soas to permit the passage of the same through the stripping-plate. Thepattern A is screwed onto a pattern block or plate 13, which issupported on a spindle C, that is guided in a box D, attached to thetable J. A spiral spring H is interposed between the under side of thepattern-block B and the upper edge of the box D, said spring lifting thepattern-block and the pattern thereon after the same has been withdrawnfrom the sand. 7

On the stripping-plate F is supported a sandbox D, which is keptin placeby means of fixed guide-pins V, which enter keepers \V, attached to thesides of the sand-box D. The sand-box D is made of wood in the usualmanner. In the sand-box D slides a frame D which is beveled at its loweredge, and which is provided with horizontal projections 19, againstwhich press spiral springs S, the lower ends of which are supported insockets of the sand-box D, as shown in Fig. 2. The sand-box D ispreferably made of two parts, which are connected by hinges at onecorner and connected at the diametrical corner. The sliding frame D isengaged by means of spring-catches 1 when it has been pressed into thesand-box D, said catches holding the frame D in its lowest position inthe sandbox D until the mold is removed from the box D. \Vhen thisisaccomplished, the spring S will readily return the sliding frame D intoits raised position, ready for the next molding operation. The spindle Gis provided witha recess or socket g, that is engaged by a sliding boltG, by which the pattern-plate and spindle are locked in position, whilethe sand is compressed in the press. A vertical slide-rod L, having abeveled upper end, engages an anti-friction roller g of the slide-boltG, and withdraws the same from the recess or socket g of the spindle 0against the tension of a spiral spring 9 placed around the shank G ofthe bolt G, as shown clearly in Fig. 1. The upward mot-ion of theslide-piece L is accomplished by means a roller N, which is locatedmidway between the supporting-rails of the track on which the truck J ismoved to and from the press, said roller engaging an inclined recess Xin the side of the slide-rod L, so as to raise thereby the slide-rod andwithdraw the slide-bolt G. The slide-bolt G and its shank G are guidedin an opening of the box D on the top of the truck K and in an openingof one of the standards E, the bolt being only actuated when themolding-machine is removed from the press. A second roller, which islocated on the transverse pivot of the roller N, engages a side recessYat the lower end of the spindle, which recess is inclined in a directionopposite to that of the recess X of the slide-rod, so as to move therebythe spindle O and the pattern-block B in downward direction for loweringthe pattern and removing it from the sand molded around the same in thebox D.

The operation of my sand-molding machine is as follows: The pattern isscrewed into position on the pattern-plate B and the spindle 0 locked inposition by the slide-bolt G, so that the pattern projects into thesand-box D. Sand is then shoveled into the sand-box D, and the truck isthen moved under the press and the slide-frame D pressed downward by thefollower of the press into the box D until the catches r engage the lugsp of the frame D and retain the same in position in the box D. The sandis thereby compressed around the pattern and the mold formed thereby.The moldingmachine is then moved away from under the press, and duringthe forward motion the slide-rod L is first actuated and the slide-boltG withdrawn by the action of the roller N, so as to unlock the spindleC, while by the second roller the spindle O, and thereby thepattern-block B, is lowered and the pattern A removed from the mold inthe sand-box. The sand mold is then removed from the box D by releasingthe catches so that the frame D is raised. The sand-box is now filled upagain, and the spindle C and pattern-block B returned to their normalposition and relocked again by the slide-bolt G, after which sand isshoveled into the box and the molding machine returned with its truck tothe press, whereby by the next operation the pressing and molding of thesand takes place. Owing to the slow withdrawal of the pattern from thesand the sand cannot stick to the patterns nor the edgesof the mold bebroken off, because when the pattern is pulled downward the sand moldrestson the straight stripping plateF, whereby a perfect mold isobtained without any injury to the same. The sand cannot interfere withany part of the machine, for in case any particles of sand should getloose they would drop downward, so that they can be readily blown out,as the apparatus is made open at the sides around the spindle C, whichis protected by its guide-box D and table J. As the sand does not blockthe machine, it performs its work regularly and in a reliable mannerwithout taking the parts apart. Reliable sand molds are thus obtained inless time and with less work as compared to other machines of this kindheretofore in use.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination of a supporting truck or carriagehaving a table attached to the same, a stripping-plate supported onstandards of said table, a pattern-block, a vertically-sliding andspring-actuated spindle for supporting said pattern-block, means forlooking said spindle to the truck, a sand-box resting on thestripping-plate and retained thereon, a spring-actnated slide-frameguided in the sand-box, and means for locking said slideframe whenforced into the sand-box bythe press, substantially as set forth.

2. The combination, in a sand-molding machine, of a pattern-block andits supporting spindle, a truck, a vertical slide-rod having a beveledupper end guided on the table of said truck, a spring-actuatedslide-bolt adapted to lock the spindle, and a roller located between thesupporting-rails of the track and adapted to engage an inclined recessof the slide-rod so as to lift the same and withdraw the bolt when thepattern is to be withdrawn from the mold, substantially as set forth.

3. The combination of a supporting truck or carriage, a table on thesame, a stripping plate supported on standards of said table, apattern-block, a pattern attached to said block, a spindle forsupporting the patternblock, a guide-box on the table of the truck forgniding said spindle, a spiral spring interposed between thepattern-block and the top of the guide-box, and a roller intermediatelybetween the supporting-rails of the track, said roller being adapted toengage an inclined recess at the lower end of the spindle for loweringthe same and withdrawing the pattern from the mold when the machine isremoved from the press, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

THEODORE SCHERF.

Witnesses:

F. J. VOGEL, J AMES MITCHELL.

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